This thesis endeavors to study Edgar Allan Poe’s and Arthur Conan Doyle’s detective stories from a male study approach. I will argue that, for personal as well as social reasons, both nineteenth century detective fiction writers face “Masculinity Crisis” when they write their detective stories. Poe didn’t meet the standard of early nineteenth century American manhood as a breadwinner because of his financial inability and his status as a southern writer, whereas Doyle also failed to become the ideal Victorian man for his insufficient income as a doctor to be a provider and protector of his family. In order to reconstruct their manliness, both of them create their detectives as omnipotent, god-like men. With their detectives exercising masculine characteristics such as reasoning skill in outwitting over their friends, the police and the criminals, and thus hold the supreme position in the literary world, Poe and Doyle attempt to rebuild their male identities in the real world. At the end, both detective writers had successfully reconstructed their masculinities in their detective stories; however, only Doyle had reclaimed his manliness in his real life later. While Poe died miserably and remained poverty-stricken for his whole life, Doyle not only rebuilt his male identity with the success of his Sherlock Holmes narratives, he even turned into an icon for British masculinity. That is why, in Holmes’s later adventures, Doyle’s detective further becomes the protector of British manhood to prevent it from the danger of various threats.